From d42ffd3ef4ab8d60af301046cda023f05dbbdab2 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Sun, 1 Mar 2026 11:57:28 -0500
Subject: Don't show GR.0 screen during loading.

---
 memsetup.asm | 5 +++++
 src/screen.c | 8 ++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/memsetup.asm b/memsetup.asm
index 3fe19d1..314a7df 100644
--- a/memsetup.asm
+++ b/memsetup.asm
@@ -5,6 +5,11 @@ memsetup
  sta $02e6  ; MEMTOP high
  lda #0
  sta $02e5  ; MEMTOP low
+ sta $022f  ; SDMCTL (turn off screen)
+ lda $14    ; RTCLOK+2
+loop
+ cmp $14    ; wait until next frame
+ beq loop
  rts
 
  *= $02e2  ; INITAD
diff --git a/src/screen.c b/src/screen.c
index 252d39d..8fd2309 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -39,10 +39,10 @@ static void scr_scroll(char s) {
 }
 
 void scr_init(void) {
-	int i, old_dma;
+	int i;
+
+	OS.sdmctl = 0; /* disappear the screen */
 
-	old_dma = OS.sdmctl;
-	OS.sdmctl = 0;
 	scr_waitvcount(112); /* after the last GR.0 line */
 	*SDLST = DLIST_BOT_ADDR;
 	OS.chbas = FONT_ADDR_HI;
@@ -56,7 +56,7 @@ void scr_init(void) {
 	strcpy(scr_names[1], "[private]");
 	scr_status[0] = scr_status[1] = SCR_INACTIVE;
 
-	OS.sdmctl = old_dma;
+	OS.sdmctl = 0x22; /* show the screen again */
 
 	scr_display(0);
 }
-- 
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